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Diffstat (limited to 'src/proguard/evaluation/Variables.java')
| -rw-r--r-- | src/proguard/evaluation/Variables.java | 347 |
1 files changed, 0 insertions, 347 deletions
diff --git a/src/proguard/evaluation/Variables.java b/src/proguard/evaluation/Variables.java deleted file mode 100644 index 4b3a2a4..0000000 --- a/src/proguard/evaluation/Variables.java +++ /dev/null @@ -1,347 +0,0 @@ -/* - * ProGuard -- shrinking, optimization, obfuscation, and preverification - * of Java bytecode. - * - * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -package proguard.evaluation; - -import proguard.evaluation.value.*; - -import java.util.Arrays; - -/** - * This class represents a local variable frame that contains <code>Value</code> - * objects. Values are generalizations of all values that have been stored in - * the respective variables. - * - * @author Eric Lafortune - */ -public class Variables -{ - private static final TopValue TOP_VALUE = new TopValue(); - - - protected Value[] values; - protected int size; - - - /** - * Creates a new Variables object with a given maximum number of variables. - */ - public Variables(int size) - { - this.values = new Value[size]; - this.size = size; - } - - - /** - * Creates a Variables object that is a copy of the given Variables object. - */ - public Variables(Variables variables) - { - // Create the values array. - this(variables.size); - - // Copy the values. - initialize(variables); - } - - - /** - * Resets this Variables object, so that it can be reused. - */ - public void reset(int size) - { - // Is the values array large enough? - if (size > values.length) - { - // Create a new one. - values = new Value[size]; - } - else - { - // Clear the variables. - Arrays.fill(values, null); - } - - this.size = size; - } - - - /** - * Initializes the values of this Variables object with the values of the - * given Variables object. The other object may have fewer values, in which - * case the remaining values are left unchanged. - */ - public void initialize(Variables other) - { - if (this.size < other.size) - { - throw new IllegalArgumentException("Variable frame is too small ["+this.size+"] compared to other frame ["+other.size+"]"); - } - - // Copy the values. - System.arraycopy(other.values, 0, this.values, 0, other.size); - } - - - /** - * Generalizes the values of this Variables object with the values of the - * given Variables object. - * @param clearConflictingOtherVariables specifies whether the other - * variables should be cleared too, - * in case of conflicts. - * @return whether the generalization has made any difference. - */ - public boolean generalize(Variables other, - boolean clearConflictingOtherVariables) - { - if (this.size != other.size) - { - throw new IllegalArgumentException("Variable frames have different sizes ["+this.size+"] and ["+other.size+"]"); - } - - boolean changed = false; - - for (int index = 0; index < size; index++) - { - Value thisValue = this.values[index]; - Value otherValue = other.values[index]; - - // Occasionally, two values of different types might be present - // in the same variable in a variable frame (corresponding to - // two local variables that share the same index), at some point - // outside of their scopes. Don't generalize the variable then, - // but let it clear instead. - if (thisValue != null && - otherValue != null && - thisValue.computationalType() == otherValue.computationalType()) - { - Value newValue = thisValue.generalize(otherValue); - - changed = changed || !thisValue.equals(newValue); - - this.values[index] = newValue; - } - else - { - changed = changed || thisValue != null; - - this.values[index] = null; - - if (clearConflictingOtherVariables) - { - other.values[index] = null; - } - } - } - - return changed; - } - - - /** - * Returns the number of variables. - */ - public int size() - { - return size; - } - - - /** - * Gets the Value of the variable with the given index, without disturbing it. - */ - public Value getValue(int index) - { - if (index < 0 || - index >= size) - { - throw new IndexOutOfBoundsException("Variable index ["+index+"] out of bounds ["+size+"]"); - } - - return values[index]; - } - - - /** - * Stores the given Value at the given variable index. - */ - public void store(int index, Value value) - { - if (index < 0 || - index >= size) - { - throw new IndexOutOfBoundsException("Variable index ["+index+"] out of bounds ["+size+"]"); - } - - // Store the value. - values[index] = value; - - // Account for the extra space required by Category 2 values. - if (value.isCategory2()) - { - values[index + 1] = TOP_VALUE; - } - } - - - /** - * Loads the Value from the variable with the given index. - */ - public Value load(int index) - { - if (index < 0 || - index >= size) - { - throw new IndexOutOfBoundsException("Variable index ["+index+"] out of bounds ["+size+"]"); - } - - return values[index]; - } - - - // Load methods that provide convenient casts to the expected value types. - - /** - * Loads the IntegerValue from the variable with the given index. - */ - public IntegerValue iload(int index) - { - return load(index).integerValue(); - } - - - /** - * Loads the LongValue from the variable with the given index. - */ - public LongValue lload(int index) - { - return load(index).longValue(); - } - - - /** - * Loads the FloatValue from the variable with the given index. - */ - public FloatValue fload(int index) - { - return load(index).floatValue(); - } - - - /** - * Loads the DoubleValue from the variable with the given index. - */ - public DoubleValue dload(int index) - { - return load(index).doubleValue(); - } - - - /** - * Loads the ReferenceValue from the variable with the given index. - */ - public ReferenceValue aload(int index) - { - return load(index).referenceValue(); - } - - - /** - * Loads the InstructionOffsetValue from the variable with the given index. - */ - public InstructionOffsetValue oload(int index) - { - return load(index).instructionOffsetValue(); - } - - - // Implementations for Object. - - public boolean equals(Object object) - { - if (object == null || - this.getClass() != object.getClass()) - { - return false; - } - - Variables other = (Variables)object; - - if (this.size != other.size) - { - return false; - } - - for (int index = 0; index < size; index++) - { - Value thisValue = this.values[index]; - Value otherValue = other.values[index]; - - // Occasionally, two values of different types might be - // present in the same variable in a variable frame - // (corresponding to two local variables that share the - // same index), at some point outside of their scopes. - // We'll ignore these. - if (thisValue != null && - otherValue != null && - thisValue.computationalType() == otherValue.computationalType() && - !thisValue.equals(otherValue)) - { - return false; - } - } - - return true; - } - - - public int hashCode() - { - int hashCode = size; - - for (int index = 0; index < size; index++) - { - Value value = values[index]; - if (value != null) - { - hashCode ^= value.hashCode(); - } - } - - return hashCode; - } - - - public String toString() - { - StringBuffer buffer = new StringBuffer(); - - for (int index = 0; index < size; index++) - { - Value value = values[index]; - buffer = buffer.append('[') - .append(value == null ? "empty" : value.toString()) - .append(']'); - } - - return buffer.toString(); - } -} |